Dr. Kei Sato is a professor in the Institute of Medical Science, the University of Tokyo, Japan. In March 2010, he got a Ph.D. (Medicine) in Institute for Virus Research, Kyoto University, Japan. In April 2018, he started his own laboratory as a principal investigator in the Institute of Medical Science, the University of Tokyo, Japan. His laboratory is named "Systems Virology", and the aim of his laboratory is to expand and deepen the knowledge and method in virology. To investigate the dynamics of virus infections such as HIV and emerging viruses including SARS-CoV-2, he uses a variety of multiscale analytic techniques, such as experimental virology, bioinformatics and molecular phylogenetic. Such interdisciplinary investigations through experimental virology and other sciences will pioneer a new scientific field of infectious diseases. In January 2021, he launched a consortium, "The Genotype to Phenotype Japan (G2P-Japan)". The scientific activity of G2P-Japan is very high and has revealed the multiple aspects of SARS-CoV-2 variants. He promoted to be a full professor in April 2022 and continues the investigations based on Systems Virology.